Doc update to RTD
Doc update to RTD

requirements.txt lists the python requirements that should be loaded by RTD. breathe is not loaded by deafult. Moreover, some versions of sphinx have issues processing mathjax, whereas 1.40 plays nice and need >1.4 for breathe.
pelahi/VELOCIraptor-STF,pelahi/VELOCIraptor-STF,pelahi/VELOCIraptor-STF